stem plug

例句：

1. 1. The stem plug is designed to prevent the plant from growing too tall.
   茎塞子的设计是为了防止植物长得太高。
2. 2.The stem plug was used to block off the water supply for the project.
   茎塞被用来阻断该项目的水供应。
3. 3.The stem plug was removed before the plant could grow any further.
   在植物可以进一步生长之前，需要移除茎塞。